Strange stone tunnels and chambers, perhaps pre-historic, have been
found in Leyden, Wendell, Pelham, Montague, New Salem, Whitingham, VT
and throughout New England. Who built these structures and when? Why?

Ashfield
stonemason Jim Vieira has been exploring local stone chambers for years
as a member of the Northeast Antiquities Research Association, which
has studied these structures for 60 years. He describes the stone
ceremonial landscape of New England, carbon-dating evidence and
historical texts.
His slides document local sites and others in New England, and he discusses what they represent and who may have built them.